Confused between John Guest Enlargers or reducers

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andypatt

Garage Brewing, Seaside Drinking
Supporting Member
Joined
Apr 30, 2020
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Worthing
Hey all,

I have bought a couple of duotight inline regulators (these have pushfit 5/16") but my lines are 3/8". I'm looking at getting a reducer / enlarger to convert the duotight to 3/8" but I'm confused on which one I need?

Can anyone tell me which one I need? it's out of:

Enlarger | John Guest PI131012S
or
Reducer | John Guest PI061210S

I think I'm just getting confused on which one is the stem OD and which one is the tube OD

Any help much appreciated!
 

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